\begin{pspicture}(0,-.5)(8,7)
  \input{fig/1d-helpers.tex}
	% Lassos.
	\pspolygon*[linecolor=lightgray,fillcolor=lightgray]
						 (4,2.45)(4.55,3)(2,5.55)(1.45,5)
	\pspolygon[linecolor=black,linestyle=dashed]
						 (3.45,1)(4,0.45)(5.55,2)(5,2.55)
	\pspolygon*[linecolor=lightgray,fillcolor=lightgray]
						 (6,2.45)(6.55,3)(4,5.55)(3.45,5)
	\pspolygon[linecolor=black,linestyle=dashed]
						 (5.45,1)(6,0.45)(7.55,2)(7,2.55)
	% Arrows and dots.
	\Eright14\Hup23\Hright23\Eup32\Eright32\Hup41
	\Eleft34\Eright34\Hleft43\Hup43\Hright43\Eleft52\Eup52\Eright52\Hup61
	\Eleft54\Hleft63\Eleft72
	% Axes.
  \Taxis016\Xaxis170  
\end{pspicture}
